Several phones 1 SIM card?

kenneth

Zealot
Gold
Aug 19, 2008
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36
Texas
#1
like the title says can I take my sim out of my 3G and place it in another 3G and it will work? I have the chance to get a 16Gb fir a ridiculous price and I will buy it if I can just put it sim in and be on my way.
 

kenneth

Zealot
Gold
Aug 19, 2008
1,465
0
36
Texas
#3
if I buy the 16gb from this person is it still covered under the Apple warranty? What are the sim pins?